大方廣佛華嚴經搜玄分齊通智方軌 5.4

5.4

一辨名者，何義故名入法界？答：其法有三種，謂意所知法、自性及軌則也，此中通三也。界者，是一切法通性，亦因亦分齊也。入者，得此法門。

First, as for distinguishing the name: on account of what meaning is it called "Entering the Dharmadhātu"? Answer: Its "dharma" has three kinds, namely, phenomena known by the mind, intrinsic nature, and rule; here it connects to all three. "Dhātu" is the universal nature of all dharmas, and is also cause and boundary. "Entering" means obtaining this Dharma-gate.